CHAPTER 7b: Nervous System. Protection of CNS. Meninges = three membranes covering the CNS structures (p 211). Duramater = outermost layer. Dura = hard Mater = mother. netterimages.com. schools-wikipedia.org. Arachnoid Mater = web-like middle layer. commons.wikimedia.org.
Protection of CNS
Meninges = three membranes covering the CNS structures (p 211)
Duramater = outermost layer
Dura = hard
Mater = mother
Arachnoid Mater = web-like middle layer
Arachno = spider
Pia Mater = innermost layer following folds
pia = gentle
Meningitis = inflammation of meninges
Cerebrospinal Fluid (CSF) = fluid surrounding the brain and spinal cord
Continually made from blood plasma in choroid plexuses which hang from the “roof” of the brains ventricles.
Circulates continuously by being produced and then drained back into blood plasma to keep a constant volume of about 150 ml.
Spinal Tap = sampling technique to test CSF.
Hydrocephalus = “water on the brain”
Made of LEAST PERMEABLE capillaries in the body.
Can’t keep out fats, respiratory gases, alcohol, nicotine, or anesthetics.
Traumatic Brain Injuries and Brain Dysfunctions
Head injuries are the leading cause of accidental death in the USA.
Concussion = slight injury, dizziness, brief loss of consciousness.
Contusion = marked tissue destruction, coma
Cerebral Edema = swelling of the brain, death
Stroke = cerebrovascular accident (CVA) occurs when circulation is cut off to the brain.
Aphasia = result of damage to left cerebral hemisphere, affects speech.
motor aphasia = affects Broca’s area and loss of speech sensory aphasia = loss of understanding of language
TIA = transient ischemic attack (mini-stroke)
BrainMatters 54:00 http://video.pbs.org/video/1390247671/
Dementia 1:01 http://www.healthscout.com/animation/1/7/main.html
Alzheimer’s Disease 19:10 http://www.alzheimer.ca/english/disease/whatisit-video.htm
About 17 inches (42 cm) long.
31 pairs of nerves arise from it.
Textbook page 217.
Paraplegic = damage low in cord